Husaby Church was the main church of the first Swedish diocese. It was built during the 11th century and the tower, which is original, is one of the oldest stone buildings still standing in Sweden. This type of triple tower is inspired by continental Carolingian architecture and is unique in Sweden with one single exception (but Husaby's tower is the more impressive by far) .
At Husaby, Sweden's first Christian king, Olof Skötkonung, is supposed to have been baptized by Saint Sigfrid, a Cistercian monk from Glastonbury. According to other accounts he was the bishop of York and was sent to Sweden by the English king Mildred on a mission to baptize the Swedish ruler.